197801 has 4 divisors (see below), whose sum is σ = 198912. Its totient is φ = 196692.

The previous prime is 197779. The next prime is 197803. The reversal of 197801 is 108791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197801 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221 + ... + 666.

It is an arithmetic number, because the mean of its divisors is an integer number (49728).

2¹⁹⁷⁸⁰¹ is an apocalyptic number.

It is an amenable number.

197801 is a deficient number, since it is larger than the sum of its proper divisors (1111).

197801 is an equidigital number, since it uses as much as digits as its factorization.

197801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 197801 is about 444.7482433917. The cubic root of 197801 is about 58.2652339091.

The spelling of 197801 in words is "one hundred ninety-seven thousand, eight hundred one".